Should I check the MOT history before buying a 2018 Sinnis Zs 125 86 Terrain?

Yes. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. A full MOT history analysis will highlight patterns that a single test result won't reveal.

What corrosion should I look for when inspecting a 2018 Sinnis Zs 125 86 Terrain?

Check brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that is expensive to fix and can fail an MOT.

How are tyres and brakes typically on a 2018 Sinnis Zs 125 86 Terrain?

Tyres and brakes are the most common advisory items on vehicles of this age. Budget for replacement if they are near the limit, and factor this into your offer price.

How many 2018 Sinnis Zs 125 86 Terrain vehicles have had dangerous defects recorded?

26% of these vehicles have had a dangerous defect recorded. Search the registration on CarHunch — the full MOT history will show exactly what was flagged and whether it was resolved.

Is the 2018 Sinnis Zs 125 86 Terrain reliable?

Based on MOT data from 275 vehicles, the 2018 Sinnis Zs 125 86 Terrain has a first-time MOT pass rate of 78.7%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

Do I need an HPI check when buying a 2018 Sinnis Zs 125 86 Terrain?

Yes. The MOT history will not show outstanding finance, insurance write-offs, or stolen status. An HPI check covers these areas and should be part of any used car purchase.

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Sinnis Zs 125 86 Terrain (2018)

275 real MOT outcomes analysed • 78.7% first-time pass rate

2018 Sinnis Zs 125 86 Terrain

CarHunch analysed 275 real MOT records for the 2018 Sinnis Zs 125 86 Terrain. Real test outcomes — pass rates, defect profiles, mileage data — from verified DVLA records. Updated as new MOTs are recorded.
Which year to buy? →

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AI Analysis Reliability Overview Check a Specific Reg Buyer's Checklist Pass Rate by Fuel Mileage Distribution Still on the Road MOT Averages Colour Breakdown Compare Models

The 2018 SINNIS ZS 125-86 TERRAIN has a first-time pass rate of just 61.8%, significantly below the UK average of 80%, which is a red flag for reliability. More concerning still is that over a quarter of these bikes (25.4%) have had a dangerous defect recorded, suggesting structural or safety issues beyond typical wear.

With a median mileage of only 8,695 miles for a six-year-old machine, these bikes are averaging 0.77 failures per test and 3.5 advisories—pointing to poor build quality rather than age-related decay. If you're considering one, budget for repairs immediately after purchase and have a trusted mechanic inspect the frame, brakes, and electrics before committing.

We have limited data for the 2018 Sinnis Zs 125 86 Terrain — treat the figures below as indicative rather than definitive.

⚠️ Over 1 in 5 of these vehicles have had a dangerous MOT failure at some point — usually tyres or brakes, and often a one-off issue rather than a persistent problem. The group stats won't tell you which one you're looking at.

First-time pass

78.7%

UK average ~80%

Around average

Dangerous (ever)

25.5%

At least once in MOT history

Check this vehicle

Avg failures / car

0.77

Over 3.4 tests on record

Moderate

Typical mileage

Middle half: 5k–14k

For context

These stats describe 275 vehicles as a group. The specific vehicle you're looking at could be the one good example or the one outlier. Run its registration to find out.

Watch for defects — worth knowing

See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 275 Sinnis Zs 125 86 Terrain cars.

Before you buy a 2018 Sinnis Zs 125 86 Terrain

Based on MOT data from 275 vehicles — here's what to check.

📋 Check the full MOT history. 25.5% of these vehicles have had a dangerous defect recorded - recurring advisories often signal problems years before they become failures.
Search the reg on CarHunch for the full MOT history, reliability stats and a free AI-powered analysis of that exact vehicle.
🔍 Brake pipes, sills and subframes are the key areas on a vehicle this age — structural rust is hard to spot without getting underneath. A mechanic will check all of this before you commit, and give you a concrete basis to negotiate on price. Inspection →
📄 Outstanding finance, insurance write-offs and clocking won't appear in the MOT records — a dedicated history check covers all of this. Our link gets you 20% off automatically. History Get 20% off via CarHunch

Pass Rate by Fuel Type

Fuel type	Vehicles	Pass rate	Avg failures
Petrol (97%)	267	78.6%	0.78

Colour Breakdown

Based on 1,103 Sinnis Zs 125 86 Terrain vehicles registered in the UK — across all years. From DVLA registration records.

Red 47.1%

520

Silver 46.5%

513

Grey 4.8%

Yellow 0.9%

Black 0.6%

Mileage Distribution

Most 2018 Sinnis Zs 125 86 Terrain vehicles sit in the blue band. If the vehicle you're looking at is outside it, it's either unusually low or high mileage for its age.

8,695

typical

5,391

low mileage

13,769

high mileage

Half of all 2018 Sinnis Zs 125 86 Terrain vehicles fall between 5,391 and 13,769 miles.

Is the mileage you're seeing normal?

✓ Under 5,391 miles — lower than most. Could be great, or could be a vehicle that rarely moved. Check test frequency and mileage progression in the MOT history.

✓ 5,391–13,769 miles — normal for age. This is where most 2018 Sinnis Zs 125 86 Terrains sit.

⚠ Over 18,588 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

2018 Sinnis Zs 125 86 Terrain — Still on the Road

Numbers are thinning — 63% of 2018 Sinnis Zs 125 86 Terrains are still active.

97 vehicles still getting MOTs in 2025 — 63% of the peak remain.

Based on vehicles from this manufacture year that had at least one MOT test in each calendar year. Data from 2021–2025.

MOT History Averages

3.4

Avg MOT tests per vehicle

0.77

Avg failures per vehicle

3.5

Avg advisories per vehicle

Other model years — Sinnis Zs 125 86 Terrain: All Zs 125 86 Terrain years → Which year to buy? →

2017 2019 2020

Or browse all models: Sinnis →

Compare with another model

See how the 2018 Sinnis Zs 125 86 Terrain stacks up against a rival.

Watch for defects — worth knowing